Table 3.
Required setup margins (mm) for the presented weekly IGRT protocol in different directions without an action level for position errors of the subregions
| Structure |
MID_PTV |
MIN_MAX |
||||||
|---|---|---|---|---|---|---|---|---|
| AP/ vertical | CC/ longitudinal | LAT/ lateral | Mean 3D | AP/ vertical | CC/ longitudinal | LAT/ lateral | Mean 3D | |
| Rigid target1 |
3.1 (0) |
3.3 (0) |
2.7 (0) |
3.1 (0) |
3.84 (04) |
4.44 (04) |
2.74 (04) |
3.64 (04) |
| Rigid target2 |
4.5 (3.2) |
4.5 (3.1) |
4.4 (3.4) |
4.5 (3.2) |
5.04 (3.34) |
5.44 (3.54) |
4.34 (3.44) |
4.94 (3.44) |
| C1-22 |
7.0 (6.2) |
4.8 (3.4) |
5.8 (5.1) |
5.9 (4.9) |
6.4 (5.1) |
6.4 (4.6) |
5.1 (4.3) |
6.0 (4.7) |
| C5-72 |
5.7 (4.7) |
5.0 (3.8) |
4.9 (4.1) |
5.2 (4.2) |
6.8 (5.6) |
6.8 (5.1) |
4.9 (4.0) |
6.1 (4.9) |
| Mandible2 |
9.6 (8.9) |
9.2 (8.5) |
6.1 (5.3) |
8.3 (7.6) |
6.3 (5.0) |
6.9 (5.2) |
5.1 (4.3) |
6.1 (4.8) |
| Occiput bone2 | 8.3 (7.6) | 6.1 (5.1) | - | 7.23 (6.33) | 7.8 (7.3) | 7.6 (6.1) | - | 7.73 (6.73) |
1Without observer errors, 2with observer errors, 32D margins for the occiput bone, 4the MIN_MAX match shifted the reference location of the target by 2.5 ± 1.2 mm (3D mean ± SD) not included in the margins.
The results for daily IGRT are given in parenthesis.